The advantage and disadvantage of the five recycling methods, direct heating, direct aqueousvapor, indirect aqueousvapor, reduced pressure distillation, precipitation method, is discussed.
探讨了直接加热法、直接水蒸汽法、间接水蒸汽法、减压蒸馏、酒精沉淀等五种回收方法的优缺点。
2
Skin contacted by HF, vapor, or aqueous solution rapidly produces an erythematous (reddened) area, often with a white or gray color at the surface caused by coagulation of tissue.